Motor vehicle lock, in particular motor vehicle door lock

Abstract

The invention relates to a motor vehicle lock, in particular a motor vehicle door lock, which is provided with an actuation lever chain (2, 3, 4, 5, 8) having at least one locking lever (5) and an actuation lever (4). The lock is also provided with an electromagnet unit (6) that alternatively retains and releases the locking lever (5). According to the invention the lock also comprises a sensor (7) monitoring the electromagnet unit (6).

1 . A motor vehicle lock comprising:
 an actuation lever chain comprising at least one latching lever and an actuation lever,   an electromagnet unit configured to selectively holds and releases the latching lever, and   a sensor configured to check and detect existence and strength of a magnetic field generated by the electromagnet unit.   
     
     
         2 . The motor vehicle lock according to  claim 1 , wherein the sensor is designed as a magnetic field sensor. 
     
     
         3 . The motor vehicle lock according to  claim 1 , wherein the sensor is arranged in an interaction area of the latching lever with the electromagnet unit. 
     
     
         4 . The motor vehicle lock according to  claim 1 , wherein the sensor is configured to detect the switching state of the electromagnet unit and to measure the magnetic field and is thus capable of diagnosis to determine whether the magnetic field is sufficient to hold the latching lever in contact with the electromagnet unit. 
     
     
         5 . The motor vehicle lock according to  claim 1 , wherein the actuation lever chain further comprises a coupling lever interacting with the latching lever. 
     
     
         6 . The motor vehicle lock according to  claim 5 , wherein the coupling lever is rotatably mounted on the actuation lever. 
     
     
         7 . The motor vehicle lock according to  claim 5 , wherein the latching lever has a driving contour acting on the coupling lever. 
     
     
         8 . The motor vehicle lock according to  claim 1 , wherein the latching lever and the actuation lever are elastically coupled to one another by a spring. 
     
     
         9 . The motor vehicle lock according to  claim 1 , wherein the coupling lever is engaged/disengaged in accordance with the electromagnet unit acting on the latching lever. 
     
     
         10 . The motor vehicle lock according to  claim 1 , wherein the latching lever is designed as a locking lever. 
     
     
         11 . The motor vehicle lock according to  claim 1  further comprising a control unit, wherein the electromagnet unit is controlled by the control unit. 
     
     
         12 . The motor vehicle lock according to  claim 11  wherein, the sensor is configured to transmit signals indicating the status of the electromagnet unit to the control unit. 
     
     
         13 . The motor vehicle lock according to  claim 11 , wherein the control unit is configured to record signals from the sensor. 
     
     
         14 . The motor vehicle lock according to  claim 1 , wherein the actuation lever chain further comprises a release lever mounted coaxially to the actuation lever. 
     
     
         15 . The motor vehicle lock according to  claim 1  wherein the latching lever is magnetizable in the interaction area with the electromagnet unit. 
     
     
         16 . The motor vehicle lock according to  claim 5  wherein the actuation lever comprises an axis of rotation, wherein the coupling lever is configured to move about the axis of rotation.